Start ICE connectivity checks as soon as the first pair is pingable.

webrtc/p2p/base/dtlstransportchannel.h

 /*
  *  Copyright 2011 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 158 matching lines @@
     channel_->SetIceCredentials(ice_ufrag, ice_pwd);
   }
   void SetRemoteIceCredentials(const std::string& ice_ufrag,
                                const std::string& ice_pwd) override {
     channel_->SetRemoteIceCredentials(ice_ufrag, ice_pwd);
   }
   void SetRemoteIceMode(IceMode mode) override {
     channel_->SetRemoteIceMode(mode);
   }
 
-  void Connect() override;
-
   void MaybeStartGathering() override { channel_->MaybeStartGathering(); }
 
   IceGatheringState gathering_state() const override {
     return channel_->gathering_state();
   }
 
   void AddRemoteCandidate(const Candidate& candidate) override {
     channel_->AddRemoteCandidate(candidate);
   }
   void RemoveRemoteCandidate(const Candidate& candidate) override {
@@ skipping 51 matching lines @@
   // transport channel became writable, or before a remote fingerprint was
   // received.
   rtc::Buffer cached_client_hello_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(DtlsTransportChannelWrapper);
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_DTLSTRANSPORTCHANNEL_H_